Ram disks/interfacing to commodity memory

I'm considering a project here where I'll need a reasonable amount
of storage in an otherwise "small" system. The spec hasn't been
firmed up yet but I imagine we're looking at a 16 bitter CPU,
probably a PIC18 or an MSP430. "Reasonable" storage in this context
means no more than 100MB. Volatility isn't a problem but the
rewrite cycles are such I'd be wary of flash storage, so I'm finding
myself drawn towards a RAM disk - i.e. not directly addressable
memory but something that can be accessed after the requisite port
set up.

Looking at memories the pricing of commodity DDR2/3 DIMMs are
certainly very attractive but I'm a little hesitant over the
interfacing requirements - I'm used to operating at a few tens of
MHz, no more than double-sided PCBs and I know next to nothing of
transmission lines. Can these memories be underclocked to that
extent and still behave nicely, or does anyone have other insights?

--
Andrew Smallshaw
andrews@xxxxxxxxxxxxxxxx
.

Relevant Pages

  • Re: max matrix size
    ... Arturo D. wrote: ... The capacity of your computer is the issue here. ... 1.5462E+11 doubles requires 2.5 Terabytes of storage. ... a reasonable amount of storage. ...
    (comp.soft-sys.matlab)
  • Re: Inductors?*!
    ... All the specs I've checked give -40C for storage though one from ... Not necessarily daft -- -55C storage is a pretty common mil spec ... Need to learn how to apply control theory in your embedded system? ...
    (sci.electronics.design)
  • Re: Inductors?*!
    ... I'm doing a battery charger design using a sepic converter. ... All the specs I've checked give -40C for storage though one from ... Not necessarily daft -- -55C storage is a pretty common mil spec ...
    (sci.electronics.design)
  • Re: Inductors?*!
    ... I'm doing a battery charger design using a sepic converter. ... All the specs I've checked give -40C for storage though one from ... Not necessarily daft -- -55C storage is a pretty common mil spec ...
    (sci.electronics.design)
  • Re: Ram disks/interfacing to commodity memory
    ... of storage in an otherwise "small" system. ... myself drawn towards a RAM disk - i.e. not directly addressable ... Looking at memories the pricing of commodity DDR2/3 DIMMs are ...
    (comp.arch.embedded)